uisplitviewcontroller - SplitViewController BUG？

Question

我设置了一个非常简单的 iOS splitView Controller 项目，它有一个非常奇怪的错误。如果您以横向模式启动应用程序，请单击一个按钮以打开另一个 View ，旋转到纵向，然后返回到起始 View - 左侧的表格菜单应该不可见，但它是......奇怪的是你不能与它互动，这让我相信它不是真的存在，而是某种人工制品。

请注意，这只会在您第一次执行时发生，然后再也不会发生，直到您以横向模式重新启动应用程序。

主 View Controller :

#import "MasterViewController.h"

#import "DetailViewController.h"


@interface MasterViewController () {
    NSMutableArray *_objects;
}

@property (nonatomic, strong)UITableView *menu;

@end

@implementation MasterViewController

- (void)awakeFromNib
{
    self.clearsSelectionOnViewWillAppear = NO;
    self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0);
    [super awakeFromNib];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
    self.navigationItem.rightBarButtonItem = addButton;
    self.detailViewController = (DetailViewController *)[[self.splitViewController.viewControllers lastObject] topViewController];

}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)insertNewObject:(id)sender
{
    if (!_objects) {
        _objects = [[NSMutableArray alloc] init];
    }
    [_objects insertObject:[NSDate date] atIndex:0];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return _objects.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    NSDate *object = _objects[indexPath.row];
    cell.textLabel.text = [object description];
    return cell;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [_objects removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
    }
}

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSDate *object = _objects[indexPath.row];
    self.detailViewController.detailItem = object;
}

@end

细节 View Controller :

#import "DetailViewController.h"
#import "StandardViewViewController.h"


@interface DetailViewController ()
@property (strong, nonatomic) UIPopoverController *masterPopoverController;

-(IBAction)buttonTapped:(id)sender;

- (void)configureView;
@end

@implementation DetailViewController

#pragma mark - Managing the detail item

- (void)setDetailItem:(id)newDetailItem
{
    if (_detailItem != newDetailItem) {
        _detailItem = newDetailItem;

        // Update the view.
        [self configureView];
    }

    if (self.masterPopoverController != nil) {
        [self.masterPopoverController dismissPopoverAnimated:YES];
    }        
}

- (void)configureView
{
    // Update the user interface for the detail item.

    if (self.detailItem) {
        self.detailDescriptionLabel.text = [self.detailItem description];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self configureView];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Split view

- (void)splitViewController:(UISplitViewController *)splitController willHideViewController:(UIViewController *)viewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)popoverController
{
    barButtonItem.title = NSLocalizedString(@"Master", @"Master");
    [self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
    self.masterPopoverController = popoverController;
}

- (void)splitViewController:(UISplitViewController *)splitController willShowViewController:(UIViewController *)viewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
    // Called when the view is shown again in the split view, invalidating the button and popover controller.
    [self.navigationItem setLeftBarButtonItem:nil animated:YES];
    self.masterPopoverController = nil;
}

-(IBAction)buttonTapped:(id)sender
{
    StandardViewViewController *sv = [[StandardViewViewController alloc]initWithNibName:@"StandardViewViewController" bundle:nil];
    [self.splitViewController presentViewController:sv animated:YES completion:nil];

}

@end

这是一个已知的错误？有解决办法吗？

Answer 1

虽然不漂亮，但解决方案建议here作品。
这是您实现解决方案的方式:

-(IBAction)buttonTapped:(id)sender
{
    StandardViewViewController *sv = [[StandardViewViewController alloc] initWithNibName:nil bundle:nil];
    sv.modalPresentationStyle = UIModalPresentationPageSheet; // <-- Add this
    [self.splitViewController presentViewController:sv animated:YES completion:nil];
}

在 StandardViewController.m 中添加:

-(void)viewWillLayoutSubviews {
    self.view.bounds = [StandardViewViewController screenBoundsForCurrentOrientation];
    [super viewWillLayoutSubviews];
}

+(CGRect)screenBoundsForCurrentOrientation {
    return [self screenBoundsForOrientation:[UIApplication sharedApplication].statusBarOrientation];
}

+(CGRect)screenBoundsForOrientation:(UIInterfaceOrientation)orientation {

    UIScreen *screen = [UIScreen mainScreen];
    CGRect fullScreenRect = screen.bounds; //implicitly in Portrait orientation.

    if(orientation == UIInterfaceOrientationLandscapeRight || orientation ==  UIInterfaceOrientationLandscapeLeft){
        CGRect temp = CGRectZero;
        temp.size.width = fullScreenRect.size.height;
        temp.size.height = fullScreenRect.size.width;
        fullScreenRect = temp;
    }

    return fullScreenRect;
}

为了使它更漂亮，您可以将 StandardViewController 的代码放入 StandardViewController 可以扩展的新类中。

而且，是的，这看起来像是一个错误。